Discuss The Viv Lab Rigid Arm

@maxson 

The less the underhang the closer the single null point will be to the runout groove.  It is also important to pay attention to the cartridge zenith since a slight offset of the Zenith from 0° will have the same net effect as a slight change in the underhang.

dave

I’m always suspicious of absolutist commentary and expressed opinions about what is the “correct” approach to any audio related topic when after continuous inflexible opinions, the opinions are not accompanied by some reference (if only vague) to how the music sounds when reproduced by the piece in question. Something….anything that relates, not to a staunchly held view of what is technically “correct”, but to how the actual sound of the music is impacted.  There’s a lot more to the sound besides obvious mistracking distortion.

Dear @intactaudio : Here are your main posts to me in even you talk about calculation where what I posted were all about LÖfgren A alignment calculations.

 

It’s really weird that in no other of your posts but only in the last one mentioned about " null points in LP surface existence ". Read carefully your first post to me with that Whaaa. From there came all other posts between you and me:

 

"

@rauliruegas

Null points calculation it not depends of any other parameter, not even tonearm EL.

Whaaaa???

you need to specify at least four parameters which typically are alignment type, inner groove diameter, outer groove And Pivot to spindle (P2S). The math then returns you two null points, effective length (EL) and offset angle. The overhang (OH) is then found by subtracting P2S from EL. The knowns and unknowns can be reworked based on the information available. Effective length can be substituted with a known overhang and the P2S returned.

dave "

 

""

Without overhang which requires an effective length to calculate the two null points cannot exist.

dave ""

 

""

I doubt Løfgren would suggest it possible to get two null points without the addition of overhang no matter how much you point him to his math.

dave """

 

What is all about?

 

Don’t you think that your last post should been the first one?:

 

"" those null points on a record surface and being able to trace through to them with a cartridge.....to get existence ""

 

Instead that you followed talking of calculations/math as me.

 

That’s is my stupidity.

 

R.

 

 

 

 

 

 

Dear @frogman  : You are rigth but the owners of that tonearm just posted that they like it and in reality no one gone in deep detail in their tonearms comparisons with selected LP tracks.

 

I even posted to intactaudio if he could share the LPs tracks that was using in his tests and his answer was:"dead silence ".

 

Such is life.

R.

I put my 9" HA arm up for sale a few easy-to-find places if anyone is interested. I’m still somewhat agnostic as to the discussion surrounding the fine details. Kind of tempting to try to put the arm to the test, but I’m mostly a 78 collector. Although I’m constantly exploring the frontiers of 78 sound engineering and restoration, I don’t have much interest in trying to break into the field of tonearm testing as a relative novice--I think I’ll stick with mysteries of the Soundsmith Strain Gauge for now along with the hot debate (in 78 circles anway) concerning digital IIR EQ curves and comparing them to their analog equivalents. That’s enough to keep me busy for months or years. For my second arm, I’m going to stick with something a bit more fixed--a few of the Viv’s adjustments were kind of troublesome with my particular plinth. I may regret selling it.